Played after lengthy deliberation, but this leads to trouble.
13. e2e3 Preparing the c3-c4 advance, one of White's plans. Perhaps it would even be better to play the other possible plan, which is to advance the pawn to e4, either now or after 13.Qa4. 13... c8e6 The bishop is developed while keeping an eye on c3-c4. 14. d1a4  14... a7a6  15. e3e4 